isrstealer | 03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998

General

Target

03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe
Size

979KB
MD5

23fe7f45473cb509c65b8e7d62210b40
SHA1

66842fba0fd099612c0b864ed145b17dea7360a9
SHA256

03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998
SHA512

5b79c781a0d3e60dcfc4461414023fabffba62b0247129dc7e673a645e81af9680b9c5f7a7df88d7193a4d019f87db1beab957746e7247888bfb69a66ade74d6
SSDEEP

12288:X/I8SxX6H5G+d3+Q/lbJwgXt06doUe2LDdX7G4oWZqCt5MOxz2IhR7LwQSX3fw1k:MuGW7zdx5XJZUAi/Xvo1f7sr8

Score

10^/10

isrstealer stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral1/memory/852-55-0x0000000000400000-0x000000000049B000-memory.dmp	family_isrstealer
behavioral1/memory/852-56-0x0000000000401130-mapping.dmp	family_isrstealer
behavioral1/memory/852-67-0x0000000000400000-0x000000000049B000-memory.dmp	family_isrstealer
behavioral1/memory/1600-70-0x0000000074100000-0x00000000746AB000-memory.dmp	family_isrstealer

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/1160-61-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1160-65-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1160-66-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1160-68-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1160-69-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1600 set thread context of 852	1600	03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe	27
PID 852 set thread context of 1160	852	vbc.exe	28

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
852	vbc.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1600 wrote to memory of 852	1600	03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe	27
PID 1600 wrote to memory of 852	1600	03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe	27
PID 1600 wrote to memory of 852	1600	03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe	27
PID 1600 wrote to memory of 852	1600	03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe	27
PID 1600 wrote to memory of 852	1600	03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe	27
PID 1600 wrote to memory of 852	1600	03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe	27
PID 1600 wrote to memory of 852	1600	03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe	27
PID 1600 wrote to memory of 852	1600	03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe	27
PID 1600 wrote to memory of 852	1600	03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe	27
PID 852 wrote to memory of 1160	852	vbc.exe	28
PID 852 wrote to memory of 1160	852	vbc.exe	28
PID 852 wrote to memory of 1160	852	vbc.exe	28
PID 852 wrote to memory of 1160	852	vbc.exe	28
PID 852 wrote to memory of 1160	852	vbc.exe	28
PID 852 wrote to memory of 1160	852	vbc.exe	28
PID 852 wrote to memory of 1160	852	vbc.exe	28
PID 852 wrote to memory of 1160	852	vbc.exe	28
PID 852 wrote to memory of 1160	852	vbc.exe	28

C:\Users\Admin\AppData\Local\Temp\03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe
"C:\Users\Admin\AppData\Local\Temp\03c8fe9384be1b196bc0ac3fd578a16110fa73e16e64dda94ef6b93ee97cb998.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1600
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:852
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
    3⤵
    PID:1160

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/852-55-0x0000000000400000-0x000000000049B000-memory.dmp

Filesize
620KB

Download
memory/852-67-0x0000000000400000-0x000000000049B000-memory.dmp

Filesize
620KB

Download
memory/1160-61-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1160-65-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1160-66-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1160-68-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1160-69-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1600-54-0x00000000752B1000-0x00000000752B3000-memory.dmp

Filesize
8KB

Download
memory/1600-58-0x0000000074100000-0x00000000746AB000-memory.dmp

Filesize
5.7MB

Download
memory/1600-70-0x0000000074100000-0x00000000746AB000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing